Long glass fiber reinforced polypropylene material adopting foaming technique and preparation method thereof

Abstract

The invention relates to a material and a preparation method thereof, and particularly relates to a long glass fiber reinforced polypropylene material adopting a foaming technique and a preparation method thereof, belonging to the technical field of materials. The long glass fiber reinforced polypropylene material comprises the following components by mass percent: 30-75wt% of polypropylene, 20-60wt% of long glass fiber, 0.5-5wt% of chemical foaming agent and 1-5wt% of compatibilizer. The viscosity of the resin is further reduced by adopting a micro-foaming technology, meanwhile, the chance that a glass fiber strong dispersing device reduces or avoids direct contact of a glass fiber bundle and a roller or a convex part is reduced, the damage to the glass fiber is reduced, and the traction resistance of a material bar is reduced. The long glass fiber reinforced polypropylene material has the beneficial effects that the product performance, quality stability and production efficiency are improved when the impregnation effect on the glass fiber caused by polypropylene resin is ensured.

Description

technical field [0001] The invention relates to a material and a preparation method thereof, in particular to a long glass fiber reinforced polypropylene material utilizing foaming technology and a preparation method thereof, and belongs to the field of material technology. Background technique [0002] Long glass fiber reinforced polypropylene is a material with longer glass fiber length and better fiber length distribution in polypropylene. Its advantages are that it can improve the mechanical properties of the product, especially the impact strength is significantly improved, the rigidity is increased, and the size is stable. The creep performance is better, which is conducive to the application in structural parts. There are some methods and devices for producing long glass fiber reinforced polypropylene resin materials and impregnated structures, such as the patent with publication number CN1810870A, in which unsaturated carboxylic acid or its anhydride is directly used...

AI Technical Summary

Problems solved by technology

There are some methods and devices for producing long glass fiber reinforced polypropylene resin materials and impregnated structures, such as the patent with publication number CN1810870A, in which unsaturated carboxylic acid or its anhydride is directly used in the formula, the main purpose is to degrade polypropylene resin , improve the fluidity, and at the same time graft the polypropylene resin to improve the interface bonding force between the glass fiber and the polypropylene resin melt. Health, pollute the environment, and corrode processing equipment, reduce the service life of equipment; Another example is the patent that publication number is CN101338051A, adds flow modifier in the formula, and purpose is to improve the fluidity of polypropylene resin, is convenient to impregnation, but flow modification The agent is PP cooling masterbatch, the main component is peroxide, which not only brings in harmful substances, but also has poor stability to the improvement of polypropylene fluidity, and product quality control is very difficult.

In the patent with the publication number CN101152767A, a kind of impregnation method is proposed. One or more sets of tension rollers are used in the impregnation mold. The glass fiber is in contact with the surface of the tension rollers, and the fiber bundles are loosened along a fold line, so as to be mixed with the molten resin. Impregnation, but its friction resistance is large, the fiber is easy to break, and the production efficiency is low; in the patent with the publication number CN101337402A, the fiber is contacted with a series of guide rollers and pressure rollers, so as to achieve fiber looseness, impregnated with molten resin, and the same friction Large resistance, easy fiber breakage, low production efficiency

The problem in the above-mentioned prior art is that since the reinforcing fiber bundles will be in forced contact with these rollers or protruding parts when they pass through the surrounding tension rollers or protruding parts under the action of tension, not only will the fibers be seriously damaged, but also the frictional resistance will be reduced. Large, low production efficiency

There is an unavoidable problem in these methods, that is, due to the damage of the fibers to form fractures, the formation of fractures damages the stability of the desired resin-impregnated structure, eventually leading to the interruption of the operation of the impregnation device, and at the same time, seriously affecting the stability and production efficiency of production

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